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  • Cho 2 số hữu tỉ a/b và c/d. Chứng minh rằng a/b > c/d thì a/b < a+c/b+d < c/d
    Bác ơi, Bán $ PP k pm mình
    mình mua pp chưa veri giá 17,.5k/$
    pm yh : chaeyeon_strong_baby
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